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(8) Share-Based Payment Arrangements (Details 7)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Notes to Financial Statements      
Expected dividend yield 0.00% 0.00% 0.00%
Expected volatility Minimum 60.00% 56.00% 54.00%
Expected volatility Maximum 61.00% 61.00% 60.00%
Risk-free interest rate Minimum 0.70% 1.00% 1.60%
Risk-free interest rate Maximum 1.20% 2.50% 3.00%
Expected term (years) 5 years 6 months 5 years 6 months 5 years 6 months
Discount for post-vesting restrictions N/A N/A N/A